[linux-2.6-block.git] / drivers / char / tpm / tpm_tis.c

/*
 * Copyright (C) 2005, 2006 IBM Corporation
 * Copyright (C) 2014, 2015 Intel Corporation
 *
 * Authors:
 * Leendert van Doorn <leendert@watson.ibm.com>
 * Kylene Hall <kjhall@us.ibm.com>
 *
 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
 *
 * Device driver for TCG/TCPA TPM (trusted platform module).
 * Specifications at www.trustedcomputinggroup.org
 *
 * This device driver implements the TPM interface as defined in
 * the TCG TPM Interface Spec version 1.2, revision 1.0.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, version 2 of the
 * License.
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pnp.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/acpi.h>
#include <linux/freezer.h>
#include "tpm.h"
#include "tpm_tis_core.h"

struct tpm_info {
	struct resource res;
	/* irq > 0 means: use irq $irq;
	 * irq = 0 means: autoprobe for an irq;
	 * irq = -1 means: no irq support
	 */
	int irq;
};

struct tpm_tis_tcg_phy {
	struct tpm_tis_data priv;
	void __iomem *iobase;
};

static inline struct tpm_tis_tcg_phy *to_tpm_tis_tcg_phy(struct tpm_tis_data *data)
{
	return container_of(data, struct tpm_tis_tcg_phy, priv);
}

static bool interrupts = true;
module_param(interrupts, bool, 0444);
MODULE_PARM_DESC(interrupts, "Enable interrupts");

static bool itpm;
module_param(itpm, bool, 0444);
MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");

static bool force;
#ifdef CONFIG_X86
module_param(force, bool, 0444);
MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
#endif

#if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
static int has_hid(struct acpi_device *dev, const char *hid)
{
	struct acpi_hardware_id *id;

	list_for_each_entry(id, &dev->pnp.ids, list)
		if (!strcmp(hid, id->id))
			return 1;

	return 0;
}

static inline int is_itpm(struct acpi_device *dev)
{
	return has_hid(dev, "INTC0102");
}
#else
static inline int is_itpm(struct acpi_device *dev)
{
	return 0;
}
#endif

static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
			      u8 *result)
{
	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

	while (len--)
		*result++ = ioread8(phy->iobase + addr);
	return 0;
}

static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
			       u8 *value)
{
	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

	while (len--)
		iowrite8(*value++, phy->iobase + addr);
	return 0;
}

static int tpm_tcg_read16(struct tpm_tis_data *data, u32 addr, u16 *result)
{
	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

	*result = ioread16(phy->iobase + addr);
	return 0;
}

static int tpm_tcg_read32(struct tpm_tis_data *data, u32 addr, u32 *result)
{
	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

	*result = ioread32(phy->iobase + addr);
	return 0;
}

static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value)
{
	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

	iowrite32(value, phy->iobase + addr);
	return 0;
}

static const struct tpm_tis_phy_ops tpm_tcg = {
	.read_bytes = tpm_tcg_read_bytes,
	.write_bytes = tpm_tcg_write_bytes,
	.read16 = tpm_tcg_read16,
	.read32 = tpm_tcg_read32,
	.write32 = tpm_tcg_write32,
};

static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
			acpi_handle acpi_dev_handle)
{
	struct tpm_tis_tcg_phy *phy;
	int irq = -1;

	phy = devm_kzalloc(dev, sizeof(struct tpm_tis_tcg_phy), GFP_KERNEL);
	if (phy == NULL)
		return -ENOMEM;

	phy->iobase = devm_ioremap_resource(dev, &tpm_info->res);
	if (IS_ERR(phy->iobase))
		return PTR_ERR(phy->iobase);

	if (interrupts)
		irq = tpm_info->irq;

	if (itpm)
		phy->priv.flags |= TPM_TIS_ITPM_POSSIBLE;

	return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg,
				 acpi_dev_handle);
}

static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);

static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
			    const struct pnp_device_id *pnp_id)
{
	struct tpm_info tpm_info = {};
	acpi_handle acpi_dev_handle = NULL;
	struct resource *res;

	res = pnp_get_resource(pnp_dev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENODEV;
	tpm_info.res = *res;

	if (pnp_irq_valid(pnp_dev, 0))
		tpm_info.irq = pnp_irq(pnp_dev, 0);
	else
		tpm_info.irq = -1;

	if (pnp_acpi_device(pnp_dev)) {
		if (is_itpm(pnp_acpi_device(pnp_dev)))
			itpm = true;

		acpi_dev_handle = ACPI_HANDLE(&pnp_dev->dev);
	}

	return tpm_tis_init(&pnp_dev->dev, &tpm_info, acpi_dev_handle);
}

static struct pnp_device_id tpm_pnp_tbl[] = {
	{"PNP0C31", 0},		/* TPM */
	{"ATM1200", 0},		/* Atmel */
	{"IFX0102", 0},		/* Infineon */
	{"BCM0101", 0},		/* Broadcom */
	{"BCM0102", 0},		/* Broadcom */
	{"NSC1200", 0},		/* National */
	{"ICO0102", 0},		/* Intel */
	/* Add new here */
	{"", 0},		/* User Specified */
	{"", 0}			/* Terminator */
};
MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);

static void tpm_tis_pnp_remove(struct pnp_dev *dev)
{
	struct tpm_chip *chip = pnp_get_drvdata(dev);

	tpm_chip_unregister(chip);
	tpm_tis_remove(chip);
}

static struct pnp_driver tis_pnp_driver = {
	.name = "tpm_tis",
	.id_table = tpm_pnp_tbl,
	.probe = tpm_tis_pnp_init,
	.remove = tpm_tis_pnp_remove,
	.driver	= {
		.pm = &tpm_tis_pm,
	},
};

#define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
		    sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");

#ifdef CONFIG_ACPI
static int tpm_check_resource(struct acpi_resource *ares, void *data)
{
	struct tpm_info *tpm_info = (struct tpm_info *) data;
	struct resource res;

	if (acpi_dev_resource_interrupt(ares, 0, &res))
		tpm_info->irq = res.start;
	else if (acpi_dev_resource_memory(ares, &res)) {
		tpm_info->res = res;
		tpm_info->res.name = NULL;
	}

	return 1;
}

static int tpm_tis_acpi_init(struct acpi_device *acpi_dev)
{
	struct acpi_table_tpm2 *tbl;
	acpi_status st;
	struct list_head resources;
	struct tpm_info tpm_info = {};
	int ret;

	st = acpi_get_table(ACPI_SIG_TPM2, 1,
			    (struct acpi_table_header **) &tbl);
	if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) {
		dev_err(&acpi_dev->dev,
			FW_BUG "failed to get TPM2 ACPI table\n");
		return -EINVAL;
	}

	if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
		return -ENODEV;

	INIT_LIST_HEAD(&resources);
	tpm_info.irq = -1;
	ret = acpi_dev_get_resources(acpi_dev, &resources, tpm_check_resource,
				     &tpm_info);
	if (ret < 0)
		return ret;

	acpi_dev_free_resource_list(&resources);

	if (resource_type(&tpm_info.res) != IORESOURCE_MEM) {
		dev_err(&acpi_dev->dev,
			FW_BUG "TPM2 ACPI table does not define a memory resource\n");
		return -EINVAL;
	}

	if (is_itpm(acpi_dev))
		itpm = true;

	return tpm_tis_init(&acpi_dev->dev, &tpm_info, acpi_dev->handle);
}

static int tpm_tis_acpi_remove(struct acpi_device *dev)
{
	struct tpm_chip *chip = dev_get_drvdata(&dev->dev);

	tpm_chip_unregister(chip);
	tpm_tis_remove(chip);

	return 0;
}

static struct acpi_device_id tpm_acpi_tbl[] = {
	{"MSFT0101", 0},	/* TPM 2.0 */
	/* Add new here */
	{"", 0},		/* User Specified */
	{"", 0}			/* Terminator */
};
MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl);

static struct acpi_driver tis_acpi_driver = {
	.name = "tpm_tis",
	.ids = tpm_acpi_tbl,
	.ops = {
		.add = tpm_tis_acpi_init,
		.remove = tpm_tis_acpi_remove,
	},
	.drv = {
		.pm = &tpm_tis_pm,
	},
};
#endif

static struct platform_device *force_pdev;

static int tpm_tis_plat_probe(struct platform_device *pdev)
{
	struct tpm_info tpm_info = {};
	struct resource *res;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "no memory resource defined\n");
		return -ENODEV;
	}
	tpm_info.res = *res;

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (res) {
		tpm_info.irq = res->start;
	} else {
		if (pdev == force_pdev)
			tpm_info.irq = -1;
		else
			/* When forcing auto probe the IRQ */
			tpm_info.irq = 0;
	}

	return tpm_tis_init(&pdev->dev, &tpm_info, NULL);
}

static int tpm_tis_plat_remove(struct platform_device *pdev)
{
	struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);

	tpm_chip_unregister(chip);
	tpm_tis_remove(chip);

	return 0;
}

static struct platform_driver tis_drv = {
	.probe = tpm_tis_plat_probe,
	.remove = tpm_tis_plat_remove,
	.driver = {
		.name		= "tpm_tis",
		.pm		= &tpm_tis_pm,
	},
};

static int tpm_tis_force_device(void)
{
	struct platform_device *pdev;
	static const struct resource x86_resources[] = {
		{
			.start = 0xFED40000,
			.end = 0xFED40000 + TIS_MEM_LEN - 1,
			.flags = IORESOURCE_MEM,
		},
	};

	if (!force)
		return 0;

	/* The driver core will match the name tpm_tis of the device to
	 * the tpm_tis platform driver and complete the setup via
	 * tpm_tis_plat_probe
	 */
	pdev = platform_device_register_simple("tpm_tis", -1, x86_resources,
					       ARRAY_SIZE(x86_resources));
	if (IS_ERR(pdev))
		return PTR_ERR(pdev);
	force_pdev = pdev;

	return 0;
}

static int __init init_tis(void)
{
	int rc;

	rc = tpm_tis_force_device();
	if (rc)
		goto err_force;

	rc = platform_driver_register(&tis_drv);
	if (rc)
		goto err_platform;

#ifdef CONFIG_ACPI
	rc = acpi_bus_register_driver(&tis_acpi_driver);
	if (rc)
		goto err_acpi;
#endif

	if (IS_ENABLED(CONFIG_PNP)) {
		rc = pnp_register_driver(&tis_pnp_driver);
		if (rc)
			goto err_pnp;
	}

	return 0;

err_pnp:
#ifdef CONFIG_ACPI
	acpi_bus_unregister_driver(&tis_acpi_driver);
err_acpi:
#endif
	platform_device_unregister(force_pdev);
err_platform:
	if (force_pdev)
		platform_device_unregister(force_pdev);
err_force:
	return rc;
}

static void __exit cleanup_tis(void)
{
	pnp_unregister_driver(&tis_pnp_driver);
#ifdef CONFIG_ACPI
	acpi_bus_unregister_driver(&tis_acpi_driver);
#endif
	platform_driver_unregister(&tis_drv);

	if (force_pdev)
		platform_device_unregister(force_pdev);
}

module_init(init_tis);
module_exit(cleanup_tis);
MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
MODULE_DESCRIPTION("TPM Driver");
MODULE_VERSION("2.0");
MODULE_LICENSE("GPL");
Commit	Line	Data
27084efe LD	1	/*
27084efe LD	2	* Copyright (C) 2005, 2006 IBM Corporation
399235dc	3	* Copyright (C) 2014, 2015 Intel Corporation
27084efe LD	4	*
	5	* Authors:
	6	* Leendert van Doorn <leendert@watson.ibm.com>
	7	* Kylene Hall <kjhall@us.ibm.com>
	8	*
8e81cc13 KY	9	* Maintained by: <tpmdd-devel@lists.sourceforge.net>
8e81cc13 KY	10	*
27084efe LD	11	* Device driver for TCG/TCPA TPM (trusted platform module).
	12	* Specifications at www.trustedcomputinggroup.org
	13	*
	14	* This device driver implements the TPM interface as defined in
	15	* the TCG TPM Interface Spec version 1.2, revision 1.0.
	16	*
	17	* This program is free software; you can redistribute it and/or
	18	* modify it under the terms of the GNU General Public License as
	19	* published by the Free Software Foundation, version 2 of the
	20	* License.
	21	*/
57135568 KJH	22	#include <linux/init.h>
	23	#include <linux/module.h>
	24	#include <linux/moduleparam.h>
27084efe	25	#include <linux/pnp.h>
5a0e3ad6	26	#include <linux/slab.h>
27084efe LD	27	#include <linux/interrupt.h>
27084efe LD	28	#include <linux/wait.h>
3f0d3d01	29	#include <linux/acpi.h>
20b87bbf	30	#include <linux/freezer.h>
27084efe	31	#include "tpm.h"
57dacc2b	32	#include "tpm_tis_core.h"
27084efe	33
399235dc	34	struct tpm_info {
51dd43df	35	struct resource res;
ef7b81dc JG	36	/* irq > 0 means: use irq $irq;
	37	* irq = 0 means: autoprobe for an irq;
	38	* irq = -1 means: no irq support
	39	*/
	40	int irq;
399235dc JS	41	};
399235dc JS	42
57dacc2b CR	43	struct tpm_tis_tcg_phy {
57dacc2b CR	44	struct tpm_tis_data priv;
4eea703c	45	void __iomem *iobase;
448e9c55 SD	46	};
448e9c55 SD	47
57dacc2b CR	48	static inline struct tpm_tis_tcg_phy to_tpm_tis_tcg_phy(struct tpm_tis_data data)
	49	{
	50	return container_of(data, struct tpm_tis_tcg_phy, priv);
	51	}
	52
41a5e1cf CR	53	static bool interrupts = true;
	54	module_param(interrupts, bool, 0444);
	55	MODULE_PARM_DESC(interrupts, "Enable interrupts");
	56
	57	static bool itpm;
	58	module_param(itpm, bool, 0444);
	59	MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");
	60
	61	static bool force;
	62	#ifdef CONFIG_X86
	63	module_param(force, bool, 0444);
	64	MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
	65	#endif
	66
1560ffe6	67	#if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
399235dc	68	static int has_hid(struct acpi_device dev, const char hid)
3f0d3d01	69	{
3f0d3d01 MG	70	struct acpi_hardware_id *id;
3f0d3d01 MG	71
399235dc JS	72	list_for_each_entry(id, &dev->pnp.ids, list)
399235dc JS	73	if (!strcmp(hid, id->id))
3f0d3d01	74	return 1;
3f0d3d01 MG	75
	76	return 0;
	77	}
399235dc JS	78
	79	static inline int is_itpm(struct acpi_device *dev)
	80	{
	81	return has_hid(dev, "INTC0102");
	82	}
1560ffe6	83	#else
399235dc	84	static inline int is_itpm(struct acpi_device *dev)
1560ffe6 RD	85	{
	86	return 0;
	87	}
3f0d3d01 MG	88	#endif
3f0d3d01 MG	89
1107d065 CR	90	static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
	91	u8 *result)
	92	{
	93	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	94
	95	while (len--)
	96	*result++ = ioread8(phy->iobase + addr);
	97	return 0;
	98	}
	99
	100	static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
	101	u8 *value)
	102	{
	103	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	104
	105	while (len--)
	106	iowrite8(*value++, phy->iobase + addr);
	107	return 0;
	108	}
	109
	110	static int tpm_tcg_read16(struct tpm_tis_data data, u32 addr, u16 result)
	111	{
	112	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	113
	114	*result = ioread16(phy->iobase + addr);
	115	return 0;
	116	}
	117
	118	static int tpm_tcg_read32(struct tpm_tis_data data, u32 addr, u32 result)
	119	{
	120	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	121
	122	*result = ioread32(phy->iobase + addr);
	123	return 0;
	124	}
	125
	126	static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value)
	127	{
	128	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	129
	130	iowrite32(value, phy->iobase + addr);
	131	return 0;
	132	}
	133
	134	static const struct tpm_tis_phy_ops tpm_tcg = {
	135	.read_bytes = tpm_tcg_read_bytes,
	136	.write_bytes = tpm_tcg_write_bytes,
	137	.read16 = tpm_tcg_read16,
	138	.read32 = tpm_tcg_read32,
	139	.write32 = tpm_tcg_write32,
	140	};
	141
399235dc JS	142	static int tpm_tis_init(struct device dev, struct tpm_info tpm_info,
399235dc JS	143	acpi_handle acpi_dev_handle)
27084efe	144	{
57dacc2b	145	struct tpm_tis_tcg_phy *phy;
41a5e1cf	146	int irq = -1;
27084efe	147
57dacc2b CR	148	phy = devm_kzalloc(dev, sizeof(struct tpm_tis_tcg_phy), GFP_KERNEL);
57dacc2b CR	149	if (phy == NULL)
448e9c55	150	return -ENOMEM;
afb5abc2	151
57dacc2b CR	152	phy->iobase = devm_ioremap_resource(dev, &tpm_info->res);
	153	if (IS_ERR(phy->iobase))
	154	return PTR_ERR(phy->iobase);
27084efe	155
41a5e1cf CR	156	if (interrupts)
41a5e1cf CR	157	irq = tpm_info->irq;
9519de3f	158
3507d612	159	if (itpm)
41a5e1cf	160	phy->priv.flags \|= TPM_TIS_ITPM_POSSIBLE;
25112048	161
41a5e1cf CR	162	return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg,
41a5e1cf CR	163	acpi_dev_handle);
27084efe	164	}
96854310	165
a2fa3fb0 SK	166	static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);
a2fa3fb0 SK	167
afc6d369	168	static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
ef7b81dc	169	const struct pnp_device_id *pnp_id)
9e323d3e	170	{
ef7b81dc	171	struct tpm_info tpm_info = {};
0dc55365	172	acpi_handle acpi_dev_handle = NULL;
51dd43df	173	struct resource *res;
7917ff9a	174
51dd43df JG	175	res = pnp_get_resource(pnp_dev, IORESOURCE_MEM, 0);
	176	if (!res)
	177	return -ENODEV;
	178	tpm_info.res = *res;
9e323d3e	179
7917ff9a	180	if (pnp_irq_valid(pnp_dev, 0))
399235dc	181	tpm_info.irq = pnp_irq(pnp_dev, 0);
7917ff9a	182	else
ef7b81dc	183	tpm_info.irq = -1;
7917ff9a	184
399235dc JS	185	if (pnp_acpi_device(pnp_dev)) {
	186	if (is_itpm(pnp_acpi_device(pnp_dev)))
	187	itpm = true;
	188
00194826	189	acpi_dev_handle = ACPI_HANDLE(&pnp_dev->dev);
399235dc	190	}
0dc55365	191
399235dc	192	return tpm_tis_init(&pnp_dev->dev, &tpm_info, acpi_dev_handle);
9e323d3e KJH	193	}
9e323d3e KJH	194
0bbed20e	195	static struct pnp_device_id tpm_pnp_tbl[] = {
27084efe	196	{"PNP0C31", 0}, /* TPM */
93e1b7d4 KJH	197	{"ATM1200", 0}, /* Atmel */
	198	{"IFX0102", 0}, /* Infineon */
	199	{"BCM0101", 0}, /* Broadcom */
061991ec	200	{"BCM0102", 0}, /* Broadcom */
93e1b7d4	201	{"NSC1200", 0}, /* National */
fb0e7e11	202	{"ICO0102", 0}, /* Intel */
93e1b7d4 KJH	203	/* Add new here */
	204	{"", 0}, /* User Specified */
	205	{"", 0} /* Terminator */
27084efe	206	};
31bde71c	207	MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);
27084efe	208
39af33fc	209	static void tpm_tis_pnp_remove(struct pnp_dev *dev)
253115b7 RA	210	{
253115b7 RA	211	struct tpm_chip *chip = pnp_get_drvdata(dev);
399235dc	212
afb5abc2 JS	213	tpm_chip_unregister(chip);
afb5abc2 JS	214	tpm_tis_remove(chip);
253115b7 RA	215	}
253115b7 RA	216
27084efe LD	217	static struct pnp_driver tis_pnp_driver = {
	218	.name = "tpm_tis",
	219	.id_table = tpm_pnp_tbl,
	220	.probe = tpm_tis_pnp_init,
253115b7	221	.remove = tpm_tis_pnp_remove,
a2fa3fb0 SK	222	.driver = {
	223	.pm = &tpm_tis_pm,
	224	},
27084efe LD	225	};
27084efe LD	226
93e1b7d4 KJH	227	#define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
	228	module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
	229	sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
	230	MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
7a192ec3	231
399235dc JS	232	#ifdef CONFIG_ACPI
	233	static int tpm_check_resource(struct acpi_resource ares, void data)
	234	{
	235	struct tpm_info tpm_info = (struct tpm_info ) data;
	236	struct resource res;
	237
51dd43df	238	if (acpi_dev_resource_interrupt(ares, 0, &res))
399235dc	239	tpm_info->irq = res.start;
30f9c8c9	240	else if (acpi_dev_resource_memory(ares, &res)) {
51dd43df	241	tpm_info->res = res;
30f9c8c9 JS	242	tpm_info->res.name = NULL;
30f9c8c9 JS	243	}
399235dc JS	244
	245	return 1;
	246	}
	247
	248	static int tpm_tis_acpi_init(struct acpi_device *acpi_dev)
	249	{
4d627e67 JG	250	struct acpi_table_tpm2 *tbl;
4d627e67 JG	251	acpi_status st;
399235dc	252	struct list_head resources;
4d627e67	253	struct tpm_info tpm_info = {};
399235dc JS	254	int ret;
399235dc JS	255
4d627e67 JG	256	st = acpi_get_table(ACPI_SIG_TPM2, 1,
	257	(struct acpi_table_header **) &tbl);
	258	if (ACPI_FAILURE(st) \|\| tbl->header.length < sizeof(*tbl)) {
	259	dev_err(&acpi_dev->dev,
	260	FW_BUG "failed to get TPM2 ACPI table\n");
	261	return -EINVAL;
	262	}
	263
	264	if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
399235dc JS	265	return -ENODEV;
	266
	267	INIT_LIST_HEAD(&resources);
ef7b81dc	268	tpm_info.irq = -1;
399235dc JS	269	ret = acpi_dev_get_resources(acpi_dev, &resources, tpm_check_resource,
	270	&tpm_info);
	271	if (ret < 0)
	272	return ret;
	273
	274	acpi_dev_free_resource_list(&resources);
	275
51dd43df	276	if (resource_type(&tpm_info.res) != IORESOURCE_MEM) {
4d627e67 JG	277	dev_err(&acpi_dev->dev,
	278	FW_BUG "TPM2 ACPI table does not define a memory resource\n");
	279	return -EINVAL;
	280	}
	281
399235dc JS	282	if (is_itpm(acpi_dev))
	283	itpm = true;
	284
	285	return tpm_tis_init(&acpi_dev->dev, &tpm_info, acpi_dev->handle);
	286	}
	287
	288	static int tpm_tis_acpi_remove(struct acpi_device *dev)
	289	{
	290	struct tpm_chip *chip = dev_get_drvdata(&dev->dev);
	291
	292	tpm_chip_unregister(chip);
	293	tpm_tis_remove(chip);
	294
	295	return 0;
	296	}
	297
	298	static struct acpi_device_id tpm_acpi_tbl[] = {
	299	{"MSFT0101", 0}, /* TPM 2.0 */
	300	/* Add new here */
	301	{"", 0}, /* User Specified */
	302	{"", 0} /* Terminator */
	303	};
	304	MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl);
	305
	306	static struct acpi_driver tis_acpi_driver = {
	307	.name = "tpm_tis",
	308	.ids = tpm_acpi_tbl,
	309	.ops = {
	310	.add = tpm_tis_acpi_init,
	311	.remove = tpm_tis_acpi_remove,
	312	},
	313	.drv = {
	314	.pm = &tpm_tis_pm,
	315	},
	316	};
	317	#endif
	318
00194826 JG	319	static struct platform_device *force_pdev;
	320
	321	static int tpm_tis_plat_probe(struct platform_device *pdev)
	322	{
	323	struct tpm_info tpm_info = {};
	324	struct resource *res;
	325
	326	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	327	if (res == NULL) {
	328	dev_err(&pdev->dev, "no memory resource defined\n");
	329	return -ENODEV;
	330	}
	331	tpm_info.res = *res;
	332
	333	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	334	if (res) {
	335	tpm_info.irq = res->start;
	336	} else {
	337	if (pdev == force_pdev)
	338	tpm_info.irq = -1;
	339	else
	340	/* When forcing auto probe the IRQ */
	341	tpm_info.irq = 0;
	342	}
	343
	344	return tpm_tis_init(&pdev->dev, &tpm_info, NULL);
	345	}
	346
	347	static int tpm_tis_plat_remove(struct platform_device *pdev)
	348	{
	349	struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
	350
	351	tpm_chip_unregister(chip);
	352	tpm_tis_remove(chip);
	353
	354	return 0;
	355	}
	356
7a192ec3	357	static struct platform_driver tis_drv = {
00194826 JG	358	.probe = tpm_tis_plat_probe,
00194826 JG	359	.remove = tpm_tis_plat_remove,
7a192ec3	360	.driver = {
afb5abc2	361	.name = "tpm_tis",
b633f050	362	.pm = &tpm_tis_pm,
7a192ec3	363	},
9e323d3e KJH	364	};
9e323d3e KJH	365
00194826 JG	366	static int tpm_tis_force_device(void)
	367	{
	368	struct platform_device *pdev;
	369	static const struct resource x86_resources[] = {
	370	{
	371	.start = 0xFED40000,
	372	.end = 0xFED40000 + TIS_MEM_LEN - 1,
	373	.flags = IORESOURCE_MEM,
	374	},
	375	};
	376
	377	if (!force)
	378	return 0;
	379
	380	/* The driver core will match the name tpm_tis of the device to
	381	* the tpm_tis platform driver and complete the setup via
	382	* tpm_tis_plat_probe
	383	*/
	384	pdev = platform_device_register_simple("tpm_tis", -1, x86_resources,
	385	ARRAY_SIZE(x86_resources));
	386	if (IS_ERR(pdev))
	387	return PTR_ERR(pdev);
	388	force_pdev = pdev;
	389
	390	return 0;
	391	}
	392
27084efe LD	393	static int __init init_tis(void)
27084efe LD	394	{
9e323d3e	395	int rc;
00194826 JG	396
	397	rc = tpm_tis_force_device();
	398	if (rc)
	399	goto err_force;
	400
	401	rc = platform_driver_register(&tis_drv);
	402	if (rc)
	403	goto err_platform;
	404
399235dc	405	#ifdef CONFIG_ACPI
00194826 JG	406	rc = acpi_bus_register_driver(&tis_acpi_driver);
	407	if (rc)
	408	goto err_acpi;
399235dc	409	#endif
9e323d3e	410
00194826 JG	411	if (IS_ENABLED(CONFIG_PNP)) {
	412	rc = pnp_register_driver(&tis_pnp_driver);
	413	if (rc)
	414	goto err_pnp;
9e323d3e	415	}
00194826	416
4fba3c3b	417	return 0;
00194826 JG	418
	419	err_pnp:
	420	#ifdef CONFIG_ACPI
	421	acpi_bus_unregister_driver(&tis_acpi_driver);
	422	err_acpi:
	423	#endif
	424	platform_device_unregister(force_pdev);
	425	err_platform:
	426	if (force_pdev)
	427	platform_device_unregister(force_pdev);
	428	err_force:
7f2ab000	429	return rc;
27084efe LD	430	}
	431
	432	static void __exit cleanup_tis(void)
	433	{
00194826	434	pnp_unregister_driver(&tis_pnp_driver);
399235dc	435	#ifdef CONFIG_ACPI
00194826	436	acpi_bus_unregister_driver(&tis_acpi_driver);
7f2ab000	437	#endif
7f2ab000	438	platform_driver_unregister(&tis_drv);
00194826 JG	439
	440	if (force_pdev)
	441	platform_device_unregister(force_pdev);
27084efe LD	442	}
	443
	444	module_init(init_tis);
	445	module_exit(cleanup_tis);
	446	MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
	447	MODULE_DESCRIPTION("TPM Driver");
	448	MODULE_VERSION("2.0");
	449	MODULE_LICENSE("GPL");